Booster burner



' Aug. 24 1943.

-W. LOTTER BOOSTER BURNER Filed Jan. 16, 1940 4 Sheets-Sheei l Aug. 24, 1943. w. LOTTER' BOOSTER BURNER Filed Jan. 16, 1940 4 Sheets-Sheet 2 Aug. 24, 1943., w. LOT'TER 2,32 0

BOOSTER BURNER Filed Jan. 16, 1940 4 Sheets-Sheet s Aug. 24, 19430 w. LOTTER 2,327,807

BOOSTER BURNER Filed Jan. 16, 1940 a 53,! a u A I JWVE/VTO)? I wimc- 4 Sheets-Shet 4 Qmwww v 2',327,8071 .BOQSTER BU R"; .7 V

I In the;drawingsi.,

- indicated by'errows.

view of aimodifi ed form of bedsterburnergy;

view of a stillfurtheijmoclifiediform i' boc'ste messenger, 1943 if i 21327307" vViliij'ziniTLqtter; Cleveland; chi-5, assigner ti;

American stove: Com iany; St. corpe reti'on ofiNew'Jersey Louis, Me; a'

. zi ii atioeza iuer '16, 19iefsei a1 iioliejiglgi 7 The ptesenteinvention 'bo ostei" burners the purpbseand object of whichis to: roe

vide in combinatien: wither cooking rangeain tid dition'al; heatingor cooking medium tor stepping: 5

v or speeding up; the, boiling or, other "cooking operi ationperformed in ar coekingt utensilfpositionedon the cooking top portionofthe rangeebove'the cooking top burners thereof. c 1

Another object of the present invention is that of providing a-booster burner {ferdirectingheat egainstthe side walls of: a cooking utensil soi asl to apply heat thereto in add-ition'tofthe heat ap: plied" in the usual and-conventional"manner tothebottom-cf the cookingutensil by'the cooking: top bur'nersof-a cooking range. 1 A still further object ofthe invention is to': fprovide' booster burners which are constructed in a novel manner which g'ives, to tl iem an im-- proved. andhighly efficient operation as-Will' more,

clearly .i and fully appear from the] fql'lovv-ing; description when read in the light flthe comepenyin'g drawings. Other specific objects, ,novelfeatl'i-res Oi con-' struction and: improvedresults will also appear; fro1n1 the following description and, accompany-i,

Jing drawings which illustrate jjthespcific.Lem?" Z bodiments{which"the 'inventiori may take inj the;

-of the desired objects-and imaccomplishment proved results;

cal sectional vievv throllghthe "cooking top -portion oj a; cooking rang e, in assoe ciation with which isillustrated" side eieva tion one of the present improved booster burners. Figune,,2

drawings; ea-portion o fwthefioq il u n b t "shown'inherizantarsection, Figure sis;agvert cai secti ia iv e t n i the-=line'3 -5359tFigure 2 lookin inthe-directionf '1 @liigureA is eltragmenteryihoriiiontal section Figure 5 is a Verticalsectional;,vie v tak Eigure dis agiraginentaryr horizontal sectional;

burner. 7v Figure 'Iis a vertical'sectionelview :taken on the line 19-1, of Figure 6 looking in the direction? indicatedby alrrows. Q 1 Figure 8"is airagmentary; horizonte section burner.

v is a tompmn view" of one {of the booster h ners: illustrateddin Figure 1 of; 111161,

the lineBr-Sbf Figure i:lopkingin hesdirection indicatedhy-arrows.

further rnccli edformci booste" thejine Q-TH: of Figure a-lookingint (Girlie- 39) I Figure e verticall sectional View taken on; he direction indicetedbverrows w The combination constituting thepreseintj v vention isone which can be utilized in connection with any type of cooking range for accomplishing practically janyztypen of; cooking, In; the

drawingsq. gas; renge anda, gals booster: burner are illustrated: but; obviously the-burners could.

beoperategi; uponotheritypes of fuel The drew-;

ings illustratea range' having 'soiid cookin top but fit, is tobe understood-that the present,

" combination and booster burner could be. utilized} 1 range; burner and upon 7 i 'supn rte stoodflthart" the accompanying drawings are with a range .of the; so-called-vopen cooking top 7 type, hereinthere is gridlabgve the main.

which the cooking uten- From theiforegoinitwill, there re be ulf dite,

merely illustrative of 1 constructions whichficenj beutilized in-the practice-oi the present inverition'but that departures from the constructions.

thereinillustreted can be made without depart 'ing from the spirit of the invention arr'clthat the invention is to be limited" onlvgby' th aftervappendedclai ns. 1 I, .i '-I-Ia,ving;refe renceto Figur A desig-nates the; cooking-top; burnerychamher: s V o leeceokingrenge whichich m er in thiswin stance aiclosed or solid top" made up oi atop'fralme I upon which is removably supported herein-- iii-t awing above-:eechiof-theg cookingitop hurnersB an outer ring. 2 an. inner ring 13;; ende central plate 4.

Fuelffor theiburnerais deliveredthrough a suite.

able e-iid conventional manifold pipe i whichn hes connection with thejnletend 6 .of thekburner g as V manifold through a suitable valve?! QWhich is- V {am n A cooking utensil C isillustr ated as being poburner- B injthe positioniiwhich is'conventional for;acookingoperation, such for instance as boilw.

ingfainid oneflof the 'booste flhurners' of :the present' invention, designated es" entirety by D, is attedgi-n :coopera tive. relationship with the sitioned on theicookirigltopkoi the range above a their lengths the inner ends 320i the bafiles have v a considerable portionof'their length 33disposed v in a vertical plane in parallelism with the adjacent side wall 14 of the utensil while adjacent I 5 the top of the battles their inner ends are inclined ture for reasons which will hereinafter more fully appear, and which is connected to some suitablesource of fuel supply. The inner wall or face [2 of. the base is inwardly and upwardly. inclined and merges into a further upwardly extending wall portion 53 which is' curved so as to be concave in respect to the vertical adjacent side wall; M of the cooking utensil. -The wall extension portion at its upper end. merges, into 1 a vertically disposedleg or wall portion l5 which is disposed parallel to and in separated relatiom ship' to thevertical side wall M of the utensil. I

At its ends the'base portion has vertically extendingend walls i6 and I'lgwhich are complerearwardly and outwardly as at 34 so thatv th top ends of the bailie end at a point 35 whichi at thetop o-frthe concave portion. l3. of the cast ing. At their lower endsthe bafllesare shaped 10 so that at theback of the burners E the baffles terminate as at 360m aline with :the rear top edge of the top walls 39 of the burners but at their 'inner lower corners extend downwardly p and are curved inwardlyand.rearwardlyasat 31 and terrninate'against-the frontwall 38 of thejburners at-a point'considerably below the burnerjetsZQ. I l Each of the bafiles 3! is provided with an opent ing 39 whichis oppositelyvdisposed in {respect to I} 2013116 'burneryjets with the resultwthat when one 'mentary in height to the height of the'inner'face. of wall of the burner made up of the wall portions 12, 13 and 15. To distinguish the wall is in the claims it will be called a vertical wall as it extends substantially at rightangles to the 'end walls 16 and ll; These end walls-havta-extending leg portions {6a and lilowhich-,e rtendfin wardly beyond the verticalleg'portionfli and whenthe burner'is in operativerelationship to y the utensil the ends of theselegs engage the oute -er face oi'the side walltj l-ot the utensil so as to position the booster burner in spaced relation-' ship tothe side of the utensiland provide a space !8 which constitutes averjtical -flueway -or passage into which air canpass through its open; bottom as indicated by thearrow 19 in Fi gure -3 of the drawings and frorh which products of combustioncan freely pass'thro-ugh its-openup per end as indicated bythearr'ows 20in the' sa'rne figure of the drawings;

In "spaced relationship. throughout 'len'g'tlr the base is provided withupWardly'extending strengthening webs 2|, 22,'and 23 which will preyentany possibility of the burnervwar'ping from heat. Additionally the burner -i'sprovidedat suitable, intervals and positions throughout its length withssupporting legs'z i which rest' u'pon the cooking top of the 'rari'ge 'and' suppo'r t'the burner in spaced relation above jsaidcooking' top;

--A pluralityof these legs" extend from the bottoms of the burners which are'designa'ted as an 5 entirety at E. -;Thes'e burners areillustrat'ed' as being formed or cast as a part ofthe main-base 9' and are connected thereto atsp'aced intervals by conduits 25 *through which "fuel'pa'sses'jfr'om the mainfmanifold l8 intothe' manifolds of the .burners EQ 3 "I I I A plurality of secondary air-inlet openings 21:

' separate the branchcon'duits' 25 'andpermit the;

upwardand inward flow of secondary 'air as indicated by arrowsyin'Figure' 3'0; the'drawings; betweenjtherearwa11s 28of the burners and-the inner wall 12 of the base Sand upwardly past theburner jets 29 which extend inwardly iroin the obliquely disposed top walls .Silof the-burn pendent burner units E which are separated from one another by substantially the entire fwidths of the. connecting f uel conduits 25 and that they are further separated by vertically disposed and inwardlyextend'ing' bafile plates 3! whichexten'd upwardly fromapproximately the centerof the tops of thejconnectingconduits 25; -It is t'oi be noted thatthe inner ends 32 of" these?baffles'do 4 cientd raft't'o entrain the necessary amountio InFigure l of tlie'drawings two booster-burners 1 areillustrated as'being usedfin combination' with' .willlbe seen that there ar ap1um1a ioflinde-"i desire to add additional cooking heatilto I Additionally the booster burner need'notbe-ne'o'es- 70" saril y semi-circular or' circular-in; configuration a but could-bemadesquareor ectangular-or in fact in any shape necessary to cooperate-properly withtheparticular cross sectional configuration] providingior a circulationth-rough'the baffles. In operation the heat 'and-hotproductsof coin- 5 bustion'generated bytheseriesot burner units E 1 are confined'from lateral escapement by the end r walls 16 and I! of the'devic'eandas a conse a w quence must travel upwardly between the several 7 I ballle plates 31- to finall'yescape through the'narrow i space or vertical fluefi8"at the to piof the;

idevicel, Th'eheat generated; by 'thegburners isf reflectedand radiated-against the fadjacn'flslde wall I4 of theuten'sil by the concavedjwalls f3 of the device and anyinterferen'ce with operation of the individual burner units is {preyentedby the severalheretofore referred toibaille plates 3!. Secondary air for the-burner 'i's fedffrom ii below as clearly indicated in ,Figiure' 3. by arrow and the operation of the-burners creates "sum secondary air to supp ort proper'combustion at the burner jets and to cause a'-'.constant' Inove i ment of hot airand hot products of combustion; against the adjacent sidewall 14' ofthe utensil and upsaid sidewall-tofescape as hasbe'endef' scribed. 'I'l'1e'booster burner will'be I cient in 'that the heat generate d by-itis onfizied in'jits application to'the adjacent side "cookingutensiljand isheld in'contac therewith 5 for a sufficient period to caiiseithe -utfensil and; 7 contents thereof to absorb thein'iajor' portion '01 f the heat of said hot products "of-combustion'be fore they-are allowed to escape to the surrounding atmosphere; I T

the utensil and they'are disposed at opposite'sides thereof. Only one booster burner is illustratedlj' in run na s jforthe-purpos eiof conveyi-n g thld optional in Y accordance withhow" great" 5 As a matter of tact; and' withoiit departing from the spirit of the invent v h, burner could-be elongated until consti uted 'ring- *which completely 1 encircles th'e' utehs 'of the .ute'nsilwith'which it is to be used. 1:

nated by F and comprises thesamefbase Sip" is illustratedas being portable in that; supported. upon. the. legs: 24 which 'itftoi'be readily? completely removed from the top of the 7 range orto-beirslici on saidltop. into any desired errequiredpositiom To faeilitatethis free movea ment of theburnertthe mainfhelisnpplyeonduit H is made flexible as hasbeen: described. ObVi-a o-uslv'a gas cook will be provided in the fuel con duit H to vcontrol thesupply erruertethebooster burner for regulating the size: oithe flames which terminate short ofstheradgieieent side bmnedrthereat or te extinguish'themccmpletely when the additional heat supplied by the booster burner is not required or desiredltlt is. tohe inventionithe mes-walls 4 he?! the-unitescasting constitiiting. the booster burner have 1 their inner "ehd's l2": inf'eng agemeht with the V side niall -hojf the Uterisihr; r i a A radiant 43 is element issiippcrte'd as indicated atlas en a recognized however that the EOGStBI burner: 01:

burner'scould be made: sethat they are immo'v; ably attached to the toirioi' the cookin range,

withoutdepaiitiiig' from the spirit-,1 or, the inven- V tion" but it is thought that the prefierahle and l more desirable-arrangement is that of. makin the booster burners portable and freely me'vabie overthetopcitthezrangerf' When both the-booster andi mainrange burners V are; in operation the-speed of. the cooking operas-j obtained by the useoithe main rangev burner only but by' regulating the size of the flames at the booster burner the degree of increased speed of 's'honldertformed a partof the bottom ef the 7 vertical Wall. 4-1 of'the unit whichwall canand' preferably stops short: of the e end; or the radianteelementi strengthening rib-,s'imilar to the hereinbefore referred to riih 7Z2, may be'prb' videdz;foriithetwallvtfh.i The inner face f the radiant element throftighost-its entire height is m separatedurelatienship to :theadjacentaside wail of the" utensil "with the resultit'hat. the hot products of combustion'travel upwardly through tion will be increased'overthat whiehiwou'ld'he the cooking operationcan'bemanually contrcll'erl' to anicety, w

The booster bar er fills a inu'eh neede'di vvant as it makesi possible the speeding eta cooking operatiox'i'and. the desirability of this will hecoihe immediately apparent to these familiar with cocking operatiens. Whenlon'ly thermain range: burner. is present the cooking 'eperatiomcannot be speeded up b'eyond the point whereit'hegreatest heat eutput'otthe rangeibiirner issre'a ehed. With the present hoosterTburn'er the additionalh'eatl applied to the sides oi. the utensil so= that greater heat absorption area; or the" utensil; and the contents thereof is IltiIiZCdYlIEQi-I transmitting to the contents of the utensil: the greatesttpossihle amonntofheat. l t

Bocsterhuifners' having specific C'QIISEI'IZEUGH different from that,il'iililedifiiilyebefbiie described:

can; be provident and; weed-with varying degrees of 3 the side wall? ments' is iprovide witha str and; preferably each section elusive I. have: illnstrated and Whieh siiggfest'mcdifications' of the inventi'er r V ther specific? booster burner eenstructi'ensivhi'ch eli'fier in construction withoutsdepartfln g' mm the spirit thereofv- Iris-'1 tebe; recognized" evenv additional me'olifijed; specific booster. burner c'enstruc tions H coul'dighe conceived. vizithoitt departing the spirit of i H theinventionr ami that themodifi'catienslillusl trailed anct abont tobe described are-ncitwto-he sides -"on: its lower eneltcarrie's theburner elements H and Jiwhich are of identical, construction. Each burner has an inclined top face o-r walltiifi;

considered as th hereinaite appended claims'beyonei a flair scope 'ei the/invent nets diefined by them, r -1 v V In Figures-"1" anclfi of th e drawings a modified formr'of booster burner: is iiliistrate'dl which is very similar in construction; tothe' preterr ediiorm V heretoiore .cies'cribed: in that fih'eifma-ih. difference resides in the use'of radiants. Parts wl'ii'ehare' similar in construction to thosepreviouslyee scribedjare designated with the same reference v numeralsand letters heretofore used.- th-isin- -v v stance the booster burner .as an entirety" is desig viding themain fuelmanifoldit fromwhi'eh fuel is} delivered to the several. burner elements-"Iii byi thegseveral connecting iuel eonduits zig 'lfhere are the same secenelasyair-inlet-openings 221' tioned intermediate the burner ;.elements and:

- there is likewise provided vertical-hf;ancliinwardiy the'v'erti'cal passageway or 'flueQQQ and escape thmiiglithe open upper e'nd. 58 thereof.

The be'oster' burner describedfhas the. advarv tage of utilizing: the efficiency whichfis; obtains-:1 V

through: the 'use-ofiradiant heat'elements'. Referring-to Figures 6 'andv'i; the'boe'ster biirne-r 'aslanientirety is; clesignateei atG and: tor -the purposefofimaking itzvariable as to? length it is, made-1 in a plurality :of: segments X: also 1Y3 Eachot these segmentsvha's a 'base 5i which is hollow toprovlide a'main fuelcenduiti 521. Each segmentfatiitsl end hasupwardlyand inWardIy' extending flahges'o'r end walls 53' which aresuitablyjseeiireclih; abutting relationship by' bolts 54 or the. like with-vti'ieirholl ow conduit base por tlOllS' arranged in registering relationship. The vertical end wallsEt-arejoinedrbya vertically extending! wallififi which isciirvecl to present a toe-- vex surface 56 whichis linopposed-relationship a uni-t; A

In Figure e answerthe cir'awihgs it isintended thatx'tw'a units X and-ens unit beiitil-ize'r li 'Theuni't Y'is' 'p'ositi oried intermediate the two in 1 warcily andfivertically extending baiiie platea fiii the illllel EIISIBFIOfWhiQh stops short of the side units 1K anrl differs therefrom b having" wall' Hi'Tof the utensil. Thisbaiile:at oppositesin whici iare ciisposedithe plurality of burher'jets 6h: BTEiS t'o-be umiersto'od of-fco-urse thati fuel" I for the burner elements is delivered to the-jets".

6| thereof from tluefmain fuel manifoldifzl At eachof its ends the unit is, provide gilwith a segxner it w which'. has tmainz horizentailyi dis-'7 posed; baseranaeonduititz above which thereis 1 vertically-1 xtenrliin rits lower vendrithe wa 1lB5-ispr0vided Withfa se-i bii-rner element' K having Oiilits. iipner'inoli ed; I?

face or top 6-! a pliiralityh-ifi burnersjets 68;

The booster burner G, like thethereinbeforei extending bane? plates 40L :the firrner oi positionedfibehind axial above each. oiitthe' burner'iinits E and .a portiomoi: its face which ,=is: epposett to: the utensilzis'. formed concaveasat M and provi'deci with outwardly extendingione shaped. elements i'e. This radiant e utensil; Each-Hot the 59g;

engthening webtfii".

rrne'cl or cast as a" l of the utensil.

atmosphere thereof. i 1

described burners, is supported in elevated relation above the top :of the range' by legs 24 with the result thatsecondaryair can readilyrflow up-Y s wardl'y past the burner ietsand'the hot products I of combustion generated by th burner elements can flow upwardly along and against thefsid'e wall of the utensil and escape through the open upper end 69 of the flueway it- 1 i tolthe utensil. In explanation of the'abov'eiit is pointed. out that' only the burners H and J mightJbe providedand that'the burner, elements K carried byjthe end'walls E5 of the end segments W might' be eliminated. :Q The reduction :of

burnersmight however be accomplished bythe' eliminationffrom the b'aflie' 56, of the burner elements 1H and J and vutiliz ing only the burner elements '14 carried by-the end walls 65 of the end segments W. j'

Themodified form of booster 'burnerillustrated in Figures Band 9 is designated as an entirety at L and, comprises a:base 12 which is hollowito form aifuel. conduit having a horizontallydisposed portion 13 and a verticallyextendingpor- ,tion' 14 which is opposed to the='adjacent side-wall I4 of the" utensil C. The booster burner is supported above the top of the range by the short legs 24. and has end walls 15 the innerends 16' of which abut the side of theutensiL; The vertical conduit between the end walllfi at its upper" end-has a concaved portioni'll terminatin in a verticaly disposed portion 13 arranged in spaced parallel'relationship :to the side Wall of the:uten'- sil. The vertical conduit isdivided into afplu'ral: ityyof chambers ,by vertically extending baflies 8B the ends of which stop short of the side wall The vertical conduits interme-' diate the bafiles'each constitute abur'ner element designated as an entirety by M and each made up directlthe heat andhot products,,of icombustion towards the. side of the utensiland' into the p passage or flue-likeconduit83' to cause the hot products of combustion to travelf'through this restrictediipassageway prior to escape into the irough the upper ,open* end 84:

1-. A heating device o application to theouter face of a side wall of a cooking utensilconiDfiS mg, base, a 'fuel supply manifold carriedg by said cooking utensil side walli'to close rtheiopeii side of said chamber, a gaseous' fuel burner sup ported by and positioned at the side of sald'base and in the lower end of said chamber,. said burner' being in thefOrmofa plurality-of separated 7 burner zunitsteach oi which-has:aJpluralityiof' burner orifices, and vertically disposed'baflles in c termediate the ends of adjacent burner units w said bail'ies being connected to said face plate and extending toward the-side wall of saidutensil.

a 2; A construction as defined in claim lawherein vertical plane and in separated-relationshipgto d .of a plurality of burner jets 8l' theburner orifices 82 of which 'aredrilled at a forwardly extending. v

It will'be obvious that the mode of operation of this particular 'embodiment of the invention is l 'similarlto that hereinbefore described'iri respect to the other spe'cific forms of ibooster burners.

v The mainsrange burner B'could be made of fuel couldibe' independently controlledeso' as to give a closer-control of the heatdelivered to the:

bottom of the utensil. Obviori'sly-thesolid cook- The inventi'on issnot to be limited by the pre cise constructions illustrated and 'des'cribed' but" 7 only tobe limited within the' legal scope" of -t1 '1efollowingiclaims, 4;; e T .1 1" 1.;

. '0v one or more burner arms 'to which'a supplyof the side wall of the utensil .to provide at theupper. end of ,theschamber' a restricted outlet passage V 3. 'A constructionr-asdefined in claim l wherein the burner is positioned in the lower end'ofisaid chamber andl'is positioned at oneside of said baseIsaid base behind said burner being provided with a secondary air inlet communicating with said chamberfata point behind the burner:'ori .-i fices of said burner-to. provide secondary-iair-ifi addition to that'which canenter'thelower open; end'of said chamber in front'ofisaid burner, and

the faceplate has aportion-whichv is curvedupwardly and inwardly'towardthe open sidenof the chamberlbut stops short thereofito provide; e at the upper end ofthecharnber ta restricted outlet passageway.

4. A heating device for application tothe outer face of a side wall of a cooking utensil compris v ing; ailbase, afuel supply-manifold carried by saidi'base, a faceplate and a pair of end;:walls extending upwardly from said base to'formthree r i I sides of a chamber having an open side and fan-z open=upper end and. as secondary air" inlet' 'at its lower end; said endiwalls adapted to engagesaidi cooking utensilside'wall tocloseithevopenisidegfof said chamben-a plurality of gaseous fuelburne'i ers supported bysaid base and positioned inthe lower end of said chamberand connected to'said f fuel supply manifoldsaid burners comprising a: plurality of spaced units along the length of "said H base and each having a plurality of burner ori-f fices,.avertically disposed'bafflel plate-in Beach space between adjacent burner units and extends ing horizontally in a direction toward'ltheside:

wall o-f-said'utensil, avertically elongated'radiant' element positioned behind: each burner'unitrand'.

' having 'aconcave shape'dportion in one of its V verticalwalls above and overhangingth'eiburner unit, and said radiant elements having an -uppe end portion-'having a side wall in spaced-rela vtionship'to' the sidewall of said utensil to re duce the size of 'thefopenirig at the upperendofsaid chamber.

construction as defined in. claim 4 where-'f. v in, said 'baseis provided'with a secondary 1;air

inlet 'conduitbehin'd each of said burnerimits,

and said conduits-having their-discharge ends communicating with 'said chamber-at a'point ire-1 hind the fur-her 'orifices'of the burner'iii'iit witl l;v

which it is associated.

fu :b rne sucn ec c as. 1 fold, one of said burners being sup 7 r I of the sidewalls of each of said 'baffieplates adjacent the lower ends of said plat'es, and" one of I said chamber. l

of said chamber.

manifold, each .orsaid 0011, 11

f ce o l s d wa Oi a. 9 e, ifi ui :wmr inalan el na tedebasa'a su pl maaiio ;car iedaby' aid hasaa :i e t an a pa r o e d'walls ex ndin pva fq wiram-sa ase 'fit?bf rii t fi cts ez id n hr as a di c lplate'tofdl eetnamesiintc.

fo mzihtc sides 1 :ichamheihariiis n o en --side and open upper end-andasecondaryfair inlet atl-its lower end, said end walls, adaptedto o n side o ai as a wluraliid f spaced e ea ly d seased hafiflc P a s aid sharpe a e endi 1 rom;sa dl qer ai to e -s 1 t e ob us d or ua na r, ,a pl li f ase portedoneah said burners'being positioned on the lower end ofreach' of said chamber end walls and'within 7. A construction as'defined-"in the face plate has a curved portion intermediate its length which overhangsall of saidburners and; acts to reflect and direct the hot products of combustion generated.- by said burners toward the side wall of said utensil, and the upper end of said face plate being disposed'in separated relationship to theside wall of said utensil to restrict the size of the opening at the upperend of said chamber. I i 8; A heatingdevice for application to the outer claim 6 wherein,

, engage said cookingu nsil side walljtolclose the a ring portion: of said face plate to restrict g ap uralrality of secondary, air... throughisaidface page at closely adjacent 7 said burner s spese baneypla ss' in of said .latfes bei g pos1 en said burner cried in each s ace ,e

units and extending in l a upper end of said chamber.

. 12. A heating device foi' applicationto the ester face of a side wall of a cooking utensilcome prising, a base, a fuel supply manifold carried r by said base, a face plate anda pair of end walls extending upwardlyfrom said base to formthree sides of a chamber having an open side and an open upper-end, said end walls being adapted to engage a side wall of said container to close the open side of said chamber a gaseous fuel burner carried by said base and, connected to.

a said fuel supply manifold, said burner being;

face of alside wall of a cooking ,utensil'comprising, an elongated base, a fuel supply manifold carried by said base, a face plate and apair of end walls extending upwardly from saidlbase to form three sides of a chamber having an open 7 side and an open upper end and alsecondary air inlet at its lower end, said end walls adapted to engage saidecooking utensil side wall to close I the open side of said chamber, a plurality of gaseous fuel burner units connected to said fuel supply manifold; each ofsaid units comprising a plurality of burner orifices extending through said face plate to direct flames into said cham her, and a plurality of secondary air inlet con duits extending through-said face plate ata plupositioned in said chamber adjacent the lower end thereof, andsaid chamber provided with air inlets for "providing secondary airfor said burner.

13; A heating device for applicationto the outer face of a side wall ofa cooking utensil comprising, a base, a fuel suppl manifold car-I V ried'by said'base'; a face plate and a pair of end walls extending upwardly from said base to form. three. sides of a chamber having an open side a andopen upper and lower ends, saidjend walls adapted to engage said cooking utensil side wall to'close theopen sidelof said chamber, a gaseous fuel burner connected to said fuel supply manirality of points closely adjacentsaid burner orifices and having their discharge ends in cornmunication with said chamber.

7 9. A construction' as defined in clainrS wherein, burner units are in spaced relation lengthwise of said face plate, a plurality of vertical fold and positioned in" the :lower end of said chamber and supported on said base at one side thereof, .said base behind said burner being provided with a secondary air inlet communicating with said chamber at a point behind the, burner orifices Ofsaid burner to provide secondary-air in addition to that which can enter the lower openend of said chamber in front of saidburner,

and' the flames and hot products of combustion.

I ofsaid burner discharging intosaid chamber baifie platesare disposed in said chamber, and one each of saidplates is positioned in the-spaces between adjacent burner units and extends in a direction across saidburnerchamber toward the open side of said chamber'and the side wall of 10. A construction as defined in claim 8 wherein, said face plate has an upper end portion po'si- 'tioned in closer'proximity tolthe side wall of said utensil than is theremaining portion .of said face pand open upper and lower ends, said end walls" adapted to engage said cooking utensil side Wallplate to restrict the size of the open upper end a 11. A heating device'forapplication to the outer face of a sidewall of a cooking utensil comprising, an elongated'base, a fuel supply r'nani fold carried by saidbase, a face plate and apair of end walls extending upwardlyfrom said base to form three sides of a chamber having an open side and an open upperend and a secondary air inlet at its lower end, said end wall being adapted to engage said cooking utensil side wall to close the 'openaside of said chamber, a plurality of' gaseous fuel burner units connected to said" fuel supply burner, said face-plate having a portion which: is curved upwardly and inwardly to provide at the upper end of the chamberarestricted outand traversing the same to escape through the upper open end thereofh p p p 14. ,A heating device for application towthe outer face of aside wall of'a cooking utensil comprising, a base a fuel supplymanifoldcarried by said base, a face plate and a pair ofend wallsextending upwardly from said base to form three sides of a chamber having an open side to close the open side of said chamber, a gaseous aryair in addition to that which can enter the lower open end of said chamber in front of'said said, Chamber andti'aver'sing'jthe saine to escape through said restricted outlet passageway. a

155A 1 heating device for application" to the outer' "face of aigside wall of' a cooking 'utensil comprising," a base, a fuersum ly manifold cariiedjbysaid base, a face plate and a pairpf' end "vsrallsextending upwardly frqm said base to form threesides 0f a; chamber' having an openside and an open upper en'd jsaidend walls adapted ,toengage ,said bobking utensilside wall to close the open side'of said chamber,'a gaseousfuel burnencarried by said base and connected to said fuel supply manifold, said'face platebeing prpvided with a portion'which is curved upwardly and inwa l dly'ftqwfliid'thebpefijside qf-the hambel 'but' has its up ere'n stopping sh'or't thereof to provide at the up'per end of-the'chagnber ad jacent the-side wallet-the container, a restr lgted outlet passageway, and the' fla'mes'and: h'qt pro I 'ucts of Combustion of sai'dsbur'nerdiseharg ing'fil into said Chamber and traversing th "same;tq escape throughsaidfirestricted Outlet-passage- 1- way at the upper end thereof; Q 16; A constructionf asfydefined in wherein, the upwardly and.- inwardly r r 've'd 'pdrf tion of the face plate terminates an'uppr en'd .pqrtion. wl lieh 'isdisposed in, a vertical plane and i in separated relationship to the-sidewall; ofjthe' 15 utensiL, r

, WILLIAM'LO'ITER.-j 

